Taxon Report

Navarretia rosulata Brand

Marin County navarretia

Print Report

Taxon Summary

Navarretia rosulata, commonly known as Marin County navarretia, is a annual herb in the Polemoniaceae that is found only in California. It occurs within Chaparral, and Closed-cone coniferous forest, growing at elevations from 200 to 635 meters. Navarretia rosulata is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Navarretia rosulata Brand
Common Name:	Marin County navarretia
Family:	Polemoniaceae
Element Code:	PDPLM0C0Z0
USDA Plants Symbol:	NARO2
Synonyms/Other Names:	Navarretia heterodoxa (Greene) Greene ssp. rosulata (Brand) Mason

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jul	May-Jul
Elevation:	200-635 (655-2085)
General Habitats:	Chaparral, Closed-cone coniferous forest
Microhabitat:	Rocky, Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	15
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	2
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	11

Location


California Endemic: True
California Counties and Islands: Name (Code)
Marin (MRN), Napa (NAP)
Quads: Name (Quad Code)
Aetna Springs (3812264), Bolinas (3712286), Chiles Valley (3812253), San Geronimo (3812216), San Rafael (3712285)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	2	13 %
Foot traffic/trampling	2	13%
Wood cutting or brush clearing	1	6%

Notes



Known from fewer than twenty occurrences.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 26 October 2025].